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I’ve got three different equations, each giving a different result;

END = (D + 10) x (1 – FHe) – 10

END = [(1 – FHe) x ata x 10] – 1

END = [FN2 x (D + 10) / 0.79] – 10

Working through them;

(D + 10) x (1 – FHe) – 10

(42 + 10) x (1 – 0.25) – 10

52 x 0.75 -10

= 41.25

and

[(1 – FHe) x ata x 10] – 1

[0.75 x 5.2 x 10] – 1

39-1

= 38

and

[FN2 x (D + 10) / 0.79] – 10

[0.47 x (42 + 10) / 0.79] – 10

[0.47 x 52 / 0.79] – 10

30.94 – 10

= 20.94

So, what have I screwed up? Is it my maths (highly possible) or have I got the equations wrong???